This has been happening to me to. I thought I'd check on here before posting a thread.

I wondered if it was something to do with the 'watch this thread box' under the comment box. I tend to click on 'watch' at the top of a thread but perhaps if that box isn't ticked under my comment, even if it has been on my TIW list and I've come to it from there, it 'unwatches' it somehow?

I use MN on my phone (safari), ipad (safari) and laptop (IE) so I haven't noticed whether it happens after I've been on one item or another.

All my watched threads just disappeared... no idea why. Posting on them didn't make them disappear before. I was able to add one back and I have one more to add back but there's others I'm sure I'm forgetting...

Never mind. I'm a moron. Turns out I have 2 accounts (I didn't know I had this one and logged in accidentally) and I log into my "new" one at home and my "old" one (this one) at work... I will PM MNHQ to see if they can be merged or... something :S

It's still doing it for me but I haven't had a chance to monitor exactly when it happens. I do think it has something to do with the 'watch this thread' box under the comment box - is this relatively new MNHQ?

Right, this happens most with one particular thread with me and it's just happened again after I've posted on it on my phone (iphone, safari).

So it's in my TIW and then I post on it on my phone and then it disappears from TIW. Thinking about it, this is probably the thread I post mostly from on my phone at the moment and the others tend to be from my laptop so I'm guessing therein lies the problem?